* Do not overwrite the cluster selection(s) when the reservation info
  comes in; that takes 5-10 seconds, and if the user has already made
  the selections, leave them alone.

* More generally, we draw the cluster selectors multiple times, and we
  were losing the previous selection. Sure, if the user selects a
  cluster and the constraint checker says it is not allowed, then its
  okay to change it (might change my mind on this). But trying too hard
  is annoying.

Get rid of a bunch of debugging console prints.